Making Pumpkin Coffee Cake Cookies is a straightforward process. Follow these steps to create these amazing treats:

1. Preheat Oven: Begin by preheating your oven to 350°F (175°C). Line a baking sheet with parchment paper.
2. Mix Wet Ingredients: In a large mixing bowl, combine the pumpkin puree, granulated sugar, brown sugar, softened butter, egg, and vanilla extract. Beat until smooth and creamy.
3. Combine Dry Ingredients: In another bowl, whisk together the flour, baking powder, baking soda, cinnamon, nutmeg, and salt.
4. Combine Mixtures: Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Be careful not to overmix. Fold in the nuts, if using.
5. Make Streusel Topping: In a small bowl, mix together the flour, brown sugar, softened butter, and cinnamon until crumbly. Set aside.
6. Scoop Cookies: Using a cookie scoop or tablespoon, drop rounded balls of dough onto the prepared baking sheet, spacing them about 2 inches apart.
7. Add Streusel: Sprinkle the streusel topping generously over each cookie.
8. Bake: Place the baking sheet in the preheated oven and bake for 12-15 minutes, or until the edges are lightly golden.
9. Cool: Remove from the oven and let the cookies cool on the baking sheet for about 10 minutes before transferring them to a wire rack to cool completely.
10. Dust with Powdered Sugar: For an extra touch of sweetness, dust the cooled cookies with powdered sugar before serving.